What term is used to describe sending the same message to the system and receiving the same response

Question

I am looking for a term here.

in messaging systems you send a request and it processes and sends a response.

if the same request is sent, it should return the same response (but it is not necessary to process the details)

It will be like providing financial data twice.

Answer 1

Is the term " idempotent " what you mean?

Answer 2

I think idempotent is the word you are looking for.

Wikipedia says : “Idempotent operations are operations that can be applied several times without changing the result.”

Answer 3

I think memoization may be what you are looking for.

The memory function “remembers” the results corresponding to a certain set of specific inputs. Subsequent calls from memorized inputs return the memorized result, rather than recounting it ...

Answer 4

Echo?

Not sure if this is what you are looking for.